Truck step



FIG. 1 is a top view of a truck step showing my new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is an enlarged forward view thereof; and,

FIG. 6 is an enlarged backward view thereof.

The broken lines shown illustrate portions of the truck step that form no part of the claimed design. 

CLAIM The ornamental design for a truck step, as shown and described. 